JP6570170B2 - Repair method of repair wall, repair ceiling and trowel finish face - Google Patents

Description

  The present invention relates to a repair wall constructed by trowel finishing, a repair ceiling, and a repair method for a face body such as a wall and ceiling constructed by trowel finishing.

Traditional Japanese architecture has troweled walls and ceilings using plaster. The trowel finish wall is generally selected from clay, earth, and, if desired, straw, hemp fiber, furin and slaked lime on one or both sides of the Komai foundation as a base material knitted in a lattice pattern such as bamboo. The surface is finished with an intermediate coating material prepared by repeatedly applying a mixture of materials to be coated with a trowel finish, and a surface material prepared by applying plaster containing slaked lime with a trowel finish. The surface material is also referred to as a top coat material. Since the plaster used for the surface material is excellent in water resistance, white and excellent in appearance, it has been widely used for a long time as a surface material, particularly as a finishing material for walls and ceilings.
The intermediate coating material may be formed in a form having a plurality of layers such as a rough wall, a large unevenness wall, and a small unevenness wall by changing the size of the soil particles and the material to be mixed according to the purpose.

Plastered walls have poor stretchability and may be damaged over time due to shrinkage due to temperature differences and external stress such as earthquakes. In particular, on the surface of a wall body in which a highly waterproof plaster surface material is superimposed on an intermediate coating material such as an earth wall, cracks may occur in the plaster surface material. There are many voids in the intermediate coating material inside the surface material, and when rainwater or the like enters from the cracks in the surface material, there is a concern that the surface material of the plaster may be peeled off, which causes a problem in appearance.
Also. Many Western-style buildings that have been actively built since the Meiji period have decorative plaster walls and plaster ceilings, and there is a technology to restore them without significantly degrading the historical value and decorative appearance of these buildings. It has been demanded.

Conventionally, when deterioration or damage such as surface peeling, cracks, cross-sectional defects and peeling occurs on a troweled wall, plastering materials with the same quality as that part, such as clay, plaster, mortar, etc. In general, repairs or reinforcements aimed at restoring to a state equivalent to the above are performed.
However, since most plastering materials used in traditional buildings are hydraulic or aerodynamic materials, it is necessary to use a certain amount of water when repairing with a trowel finish. The repaired part may cause a shrinkage phenomenon by drying in the process. As a result, the repaired part in contact with the undamaged part undergoes a shrinkage phenomenon during the curing process, re-degradation occurs in another part, or the integrity of the repaired part and the part that has not been repaired as a wall surface There was a problem that could not be maintained.
In other words, as described above, partial repair was difficult, so in order to maintain the appearance, as a result, the plaster material similar to the earth wall to be repaired was used, and the plaster material on the entire surface was suspended, and again The plastering material equivalent to the earth wall was completely repainted from scratch to the base material, which required a lot of time and money.
Therefore, as a repair material with a low curing shrinkage rate used for restoration of plastering materials, etc., cement, acrylic copolymer re-emulsified resin powder whose surface is coated with a water-soluble protective colloid of polyvinyl alcohol, an expansion material and a shrinkage reducing agent There has been proposed a cement composition that contains (see, for example, Patent Document 1).

In addition, as a method of repairing the mortar material, a cured mortar body is formed in a missing portion such as a wall, and after flattening the surface, a coating film is formed using a waterproof polymer cement composition so as to cover the hydraulic mortar cured body. A construction method of a mortar finish structure in which a waterproof layer is provided has been proposed (see, for example, Patent Document 2).
Unlike plaster-finished walls, stucco ceilings are more difficult to reinforce, so mortar and other fillers are applied where cracks appear, but in places where collapse is a concern, the bottom of the plaster ceiling There is only a method of sticking a plate on the surface, the appearance is remarkably impaired, and a fundamental solution such as restoration and reinforcement has not been reached.

JP 2009-102216 A JP 2010-18492 A

However, the composition described in Patent Document 1 is mainly intended to be applied to a structure containing a mortar material, and when this is used for a structure constructed with plastering material, surface repair is possible. It does not reinforce the interior. In addition, there is a limit to the shrinkage suppression as a repair material, and it has not been able to eliminate the difference in appearance between the repaired part and the part before repairing, and repairing historical buildings where appearance is important There is a problem that it is difficult to apply.
Similarly, the technique described in Patent Document 2 is also a technique intended to be applied to a mortar material structure, and can be applied to repair of cracks on the surface of a wall or the like, but a polymer cement composition is applied to the surface. Similar to the technique described in Patent Document 1, it is difficult to apply to the repair of a traditional plaster finished face from the viewpoint of appearance.

  The subject of this invention is providing the repair wall and repair ceiling which repaired the damage location in the wall or ceiling formed by trowel finishing, the strength fall location, etc., and these restoration methods.

The present inventors have found that the above problems can be solved by using an acrylic resin cured body using a specific acrylic resin composition, and have completed the present invention.
The present invention includes the following aspects.
According to a first aspect of the present invention, there is provided a wall including a base material, an intermediate coating material finished with a trowel on the base material, and a surface material finished with a trowel on the intermediate coating material, and the surface A repair comprising: an injection hole drilled into the wall body from the surface of a material; and an acrylic resin cured body filled in the injection hole and penetrating from the hole wall of the injection hole into the wall body and cured. It is a wall.

In the repair wall of the first aspect of the present invention, the cured acrylic resin exists in the injection hole drilled in the wall body and in the gap between the soil particles contained in the wall body, and the plant trunk and the projecting wall project from the trunk. The cured body is in a state where the roots are connected. This acrylic resin cured body plays the role of an anchor, and the base material, the intermediate coating material, and the surface material are integrally fixed via the acrylic resin cured body, and peeling of the surface material, intermediate coating material, and surface material Collapse is suppressed.
In addition, the acrylic resin composition filled in the injection hole penetrates into the cracks generated in the surface material or the gap between the surface material formed by floating the surface material and the intermediate coating material, The surface of the material is repaired.

  A second aspect of the present invention is the repair wall according to the first aspect, wherein a hole wall surface of the injection hole has a downward slope from the surface material of the wall body into the wall body.

  Since the hole wall surface of the injection hole has a downward slope from the surface material of the wall body into the wall body, the load on the wall body acting on the cured acrylic resin formed in the injection hole is reduced. Since the portion can be borne as an axial force of the acrylic resin cured body, the load that can be borne becomes larger compared to the acrylic resin cured body filled in the injection hole formed horizontally.

  A third aspect of the present invention is the first aspect or the second aspect, wherein a string-like reinforcing material is fixed in the acrylic resin cured body from the injection hole to a deep portion of the wall body. It is a repair wall.

  The cured acrylic resin is reinforced by fixing the reinforcing material in the cured acrylic resin. Further, by using a string-like reinforcing material as the reinforcing member, arranging the reinforcing material fibers so as to spread on the surface of the surface material, and taking an aspect of fixing to the surface of the surface material with the acrylic resin composition, the surface material The resistance to peeling and peeling off becomes greater.

  In the fourth aspect of the present invention, the acrylic resin composition forming the cured acrylic resin contains at least one monomer selected from acrylic monomers and methacrylic monomers, a thermosetting resin, and a curing agent. The repair wall according to any one of the first to third aspects, which is an acrylic resin composition.

  The acrylic resin composition is an acrylic resin composition containing at least one monomer selected from an acrylic monomer and a methacryl monomer, a thermoplastic resin, and a curing agent, and compared with an epoxy resin or the like. Further, the permeability into the interior of the wall body is better, and it penetrates quickly to the deep part of the wall body and the like to form a cured acrylic resin, and a higher reinforcing effect is obtained. Furthermore, since the volume shrinkage at the time of curing is suppressed compared to a resin composition obtained by dissolving a resin in a solvent, stress concentration and generation of new voids due to volume shrinkage at the time of acrylic resin cured body formation Can be suppressed.

  According to a fifth aspect of the present invention, there is provided a ceiling or wall face comprising a base material, an intermediate coating material finished with a trowel on the base material, and a surface material finished with a trowel on the intermediate coating material. A step of drilling an injection hole from the surface of the face piece to a repair target, a step of filling the injection hole with an acrylic resin composition and injecting the acrylic resin composition from the hole wall of the injection hole to the face piece; A method of repairing a ceiling or wall face piece having a step of allowing the acrylic resin composition injected from the injection hole to penetrate into a void included in the face piece and curing to form an acrylic resin cured body.

  According to the repair method of the fifth aspect of the present invention, the acrylic resin composition is formed between the surface material and the intermediate coating material by drilling the injection hole in the repair target portion and filling the acrylic resin composition. The surface material, the intermediate coating material, and the particles contained in the intermediate coating material are firmly fixed by penetrating into the voids between the formed voids, soil particles contained in the intermediate coating material, straw, etc. and curing. Can be effectively repaired and reinforced by simple methods. Moreover, although the injection hole is formed in the surface material, since the injection hole is filled with the acrylic resin cured body, the deterioration of the appearance of the surface material is suppressed.

  According to a sixth aspect of the present invention, there is provided a plate member that is spanned between the beams, a ceiling member that is finished with a trowel from the lower surface of the plate member, and an upper surface of the plate member that reaches the ceiling member. It is a repair ceiling having a plurality of injection holes formed at intervals in the longitudinal direction of the plate material, and an acrylic resin cured body that fills the injection holes and penetrates and hardens into the ceiling material.

  The repair ceiling according to the sixth aspect of the present invention includes a gap formed between a plate member and a ceiling member finished with a trowel with a gap between beams, and an injection formed in the ceiling member finished with a trowel. An acrylic resin cured body exists in the hole, and this acrylic resin cured body plays the role of an anchor, and the ceiling material is prevented from peeling off from the plate material.

  According to a seventh aspect of the present invention, the injection hole has a string-like reinforcing material that is inserted into the injection hole and straddles the injection hole formed in the adjacent plate material through the upper surface of the plate material. It is the repair ceiling of the said 6th aspect which further has an acrylic resin hardened | cured material which the composition osmose | permeated the said reinforcing material and hardened | cured.

  The presence of the string-like reinforcing material in the cured acrylic resin in the injection hole reinforces the cured acrylic resin, and the acrylic resin composition penetrates and cures the string-shaped reinforcing material, so that the adjacent plate material By connecting the cured acrylic resin bodies to each other, a load is transmitted between the adjacent cured acrylic resin bodies, and the ceiling material peeling suppression function is further improved.

  ADVANTAGE OF THE INVENTION According to this invention, the repair wall and repair ceiling which repaired the damage location in the wall or ceiling formed by trowel finishing, the strength fall location, etc., and these repair methods are provided.

It is the perspective view which a partially fractured repair wall of one mode of the present invention. It is a partial expanded sectional view which shows the repair wall of 1 aspect of this invention. (A)-(C) are schematic sectional drawings which show a process when the repair method of 1 aspect of this invention is applied to a wall body. (D)-(E) are schematic sectional drawings which show the process after the (C) process shown to FIGS. 3-1 when the repair method of 1 aspect of this invention is applied to a wall body. In the repair method of 1 aspect of this invention, it is sectional drawing which shows the aspect which formed the injection hole in the surface material and formed the acrylic resin hardening body between the surface material and the intermediate coating material. It is the perspective view and enlarged view which show the repair ceiling of 1 aspect of this invention. It is sectional drawing which shows the repair procedure of the repair ceiling of 1 aspect of this invention. It is a graph which shows the adhesion strength of the repair wall of a present Example which has the adhesion strength of the soil wall of a control example, and an acrylic resin hardening body.

Hereinafter, a repair wall and a repair ceiling which are one embodiment of the present invention will be described in detail.
In the present invention, the “wall or ceiling formed by trowel finishing” includes structures that are manually finished by trowel, such as earth walls, plaster walls, mortar walls, plaster ceilings, mortar ceilings, and the like. Further, in the present invention, “damaged part” refers to cracks in the wall or ceiling, sand lines on the surface, flapping, partial peeling of the surface material or intermediate coating material, and their entire peeling, loss to the depth of the wall, Furthermore, it includes both planar and depth damaged portions such as a portion where the strength of the damaged portion is reduced.

[Repair wall]
As shown in FIG. 1, the repair wall 10 includes a base material 12, an intermediate coating material 14 (hereinafter, simply referred to as “intermediate coating material 14”) finished with a trowel on the base material 12, and From the surface of the surface material 16 to the wall body 11 to be repaired, the surface material 16 (hereinafter, simply referred to as “surface material 16”) finished with a trowel on the intermediate coating material 14 An injection hole 18 drilled into the wall 11, and an acrylic resin cured body 20 filled in the injection hole 18 and penetrating into the wall 11 from the hole wall of the injection hole 18 and cured. Have.
As shown in FIG. 2, the cured acrylic resin 20 has a space between the surface material 16 and the intermediate coating material 14 and the soil particles included in the intermediate coating material 14 from the portion corresponding to the trunk filled in the injection hole 18. It is continuously formed in the shape of the root that arises from the trunk into the gap. It is preferable to form the injection hole 18 at or near the crack 22 generated in the surface material 16 because the repair of the crack 22 and the reinforcement inside the wall body 11 can be performed simultaneously.

The acrylic resin cured body 20 is formed by the acrylic resin composition filled in the injection hole 18 penetrating from the hole wall of the injection hole 18 into the gap of the wall body, and then the penetrated acrylic resin composition is cured. .
The formed acrylic resin cured body 20 plays a role of an anchor, and the base material 12, the intermediate coating material 14 and the surface material 16 are integrally fixed, and the surface material 16 is peeled off, and the intermediate coating material 14 and the surface material 16 collapse. Is suppressed.
Further, the acrylic resin composition filled in the injection hole 18 penetrates into the crack 22 generated in the surface material 16, and the surface of the surface material 16 is repaired.

By adjusting the perforation depth of the injection hole 18, it is possible to control the formation location of the acrylic resin cured body 20 formed inside the repair wall 10.
For example, by setting the depth of the injection hole 18 to reach the surface of the intermediate coating material 14, the acrylic resin composition penetrates into the gap between the surface material 16 and the intermediate coating material 14, and the cured acrylic resin 20 Since the surface material 16 and the intermediate coating material 14 are fixed to each other, the surface material 16 is prevented from being peeled off due to the interference.
By setting the depth of the injection hole 18 to the vicinity of the base material 12, the acrylic resin cured body 20 is formed in the space between the soil particles and the like included in the intermediate coating material 14 up to the deep portion of the intermediate coating material 14. An intermediate coating material 14 corresponding to the finished earth wall is reinforced, and the repair wall 10 includes the intermediate coating material 14 that is less likely to be deformed, collapsed, etc., and is more durable than before repair. Become.

In a preferred embodiment of the present invention, the hole wall surface of the injection hole 18 can be inclined downward from the front surface of the wall body into the wall body.
By making the hole wall surface of the injection hole 18 downwardly inclined, a part of the load of the wall body acting on the acrylic resin cured body 20 formed inside the injection hole 18 can be borne as the axial force of the acrylic resin cured body 20. Therefore, compared with the acrylic resin cured body 20 filled in the injection hole 18 formed horizontally, the load that can be borne becomes large. In addition, when the acrylic resin composition is injected to form the acrylic resin cured body 20, the injection hole 18 has a downward slope, so that the injected acrylic resin composition quickly flows into the deep portion of the injection hole 18. Therefore, the injection amount per unit time can be increased. Furthermore, since a large amount of the acrylic resin composition penetrates into the voids between the soil particles from the hole wall surface to the periphery of the injection hole 18, the acrylic resin cured body 20 can be formed more efficiently and over a wider range. Strength is further improved.

In another preferable aspect of the present invention, a string-like reinforcing material 24 can be fixed in the acrylic resin cured body 20 from the injection hole 18 to the surface of the surface material 16.
The acrylic resin cured body 20 is reinforced by fixing the reinforcing material 24 in the cured acrylic resin body 20, and the fibers of the string-like reinforcing material 24 spread on the surface of the surface material 16 to form the flange portion 17. In addition, since the reinforcing material 24 is fixed to the surface of the surface material 16 by the acrylic resin composition that has penetrated between the fibers of the string-like reinforcing material 24, the resistance to peeling and peeling of the surface material 16 is further increased. (See FIG. 3E).

[Repair method]
The repair method as one aspect | mode which forms the repair wall 10 of this invention is demonstrated.
The repair method of the present invention includes a base material, an intermediate coating material finished with a trowel on the base material, and a surface material finished with a trowel on the intermediate coating material. A step of injecting an injection hole from the surface of the face piece (injection hole forming step) in a portion; filling the injection hole with an acrylic resin composition; and injecting the acrylic resin composition into the face piece from the hole wall of the injection hole A step (acrylic resin injecting step), a step of infiltrating the acrylic resin composition injected from the injection hole into the voids of the face body and curing to form an acrylic resin hardened body (acrylic resin hardened body forming step), A method of repairing a ceiling or a wall face having a wall.

Hereinafter, with reference to FIG. 3, the repair method applied to preparation of the repair wall 10 is demonstrated.
(Injection hole forming process)
First, as shown in FIG. 3A, an injection hole 18 is formed from the surface material 16 of the wall 11 to be repaired toward the intermediate coating material 14. The injection hole 18 can be formed using a known drilling method such as a drilling method. The drill used at the time of drilling is a rotary drill that can be controlled to the number of rotations according to the strength of the wall 11 to be repaired, that is, the resistance force at the time of drilling, and the components around the injection hole 18 formed by drilling. It is preferable to carry out by a method that does not damage the intermediate coating material 14 or the like constituting the adhesion or repair wall 10. From the viewpoint of further improving the permeability of the acrylic resin, after the formation of the injection hole 18, appropriate cleaning of the injection hole 18 for removing cutting waste, cutting powder and the like generated during drilling in the injection hole 18 is performed. preferable. Cleaning of the injection hole 18 can be performed by a method of scattering and removing cutting waste and cutting powder with a simple pneumatic dropper.

When forming the injection hole 18, it is preferable that the hole wall surface of the injection hole 18 has a downward slope from the front surface of the wall body 26 into the wall body 26. The gradient is represented by θ in FIG. 3A, and when θ = 0 °, the hole wall surface of the injection hole 18 is an injection hole that is horizontal to the ground when the wall 26 is formed perpendicular to the ground. 18
The magnitude of the downward gradient is preferably such that θ exceeds 0 ° and is 60 ° or less, more preferably in the range of 15 ° to 50 °, and further preferably in the range of 30 ° to 45 °. .
When repairing and reinforcing the vicinity of the surface material 16 of the wall body 26, the downward gradient may be small. On the other hand, when reinforcing to the deep part of the intermediate coating material 14 in the wall body 26, it is preferable that (theta) shall be 45 degrees or more.

In FIG. 3B, a string-like reinforcing material 24 is arranged in the drilled injection hole 18.
The reinforcing material 24 is not always necessary, but the cured acrylic resin can be reinforced by fixing the reinforcing material 24 in the formed cured acrylic resin 20.
As shown in FIG. 3B, the acrylic resin composition is injected in the next step by arranging the fibers of the string-like reinforcing material 24 so as to spread on the surface of the surface material 16, and then the acrylic resin composition. When the cured acrylic resin 20 is formed by curing the fiber, the fibers of the string-like reinforcing material 24 are fixed to the surface of the surface material 16, so that the resistance to peeling and peeling of the surface material 16 can be further increased. it can.
As the reinforcing material 24, a material having a relatively small fiber diameter and high breaking strength is preferable, and examples thereof include a material formed by twisting hemp fibers, rice straw and the like into a string shape. Moreover, it is preferable that the string-like reinforcing material 24 formed by twisting has a gap through which an alkali resin composition described later can permeate. Among these, the reinforcing material 24 is preferably a string-shaped reinforcing material formed by twisting fibers having a certain thickness and fiber strength, such as a hemp string, from the viewpoint of a good reinforcing effect. When a rope formed by twisting rice straw is used as a reinforcing material, depending on the twisting method, the fibers may be rigid and the gaps between the fibers may be wide. In such a case, the acrylic resin composition may be between the fibers. It may be difficult to penetrate and the desired strength improvement effect may not be achieved.

(Acrylic resin injection process)
Next, as shown in FIG. 3 (C), a string-like reinforcing material 24 is inserted into the injection hole 18 and the acrylic resin composition is injected with the end of the reinforcing material protruding from the injection hole 18. . The injection can be performed by a known method. For example, a method of injecting acrylic resin using an injector 19 having a piston such as a syringe on the back side of the injection hole 18 is preferable. The acrylic resin is injected into the internal void portion by a low-pressure injection method because the acrylic resin naturally penetrates into the void of the intermediate coating material 14 from the injection hole 18 and the inner wall surface of the injection hole 18 without involving air or the like. It is preferable to use a method of injecting and filling while maintaining a constant pressure.
Here, when the depth of the injection hole 18 is, for example, a depth reaching the base material 12, the injection method from the tip of the injection needle ensures that the acrylic resin composition reaches the deep portion of the injection hole 18. There is a concern that it does not flow down, penetrates from the inner wall surface of the injection hole 18, reaches a sufficient depth, and does not stay at the bottom of the injection hole 18. Therefore, at the time of disclosure in the injection of the acrylic resin composition in the deep injection hole 18, it is preferable to attach a flexible hose or the like to the tip of the syringe and start pouring from the deep part of the injection hole 18 first. In this way, the deep part of the intermediate coating material can be reliably repaired by allowing the acrylic resin composition to reach the intermediate coating material 14 in the vicinity of the base material 12 where there are many rough materials and relatively many voids from the deep part. Therefore, it is preferable.

  In the preferred embodiment of the present invention, since the injection hole 18 forms a downward gradient from the surface of the wall material 11 to be repaired to the inside, the acrylic resin composition quickly reaches the deep part of the injection hole 18. Then, the acrylic resin composition injected into the injection hole 18 gradually permeates into the gap between the soil particles and the like contained in the intermediate coating material 14 from the hole wall surface. The permeation is performed from the inner wall surface of the injection hole 18 toward the periphery by permeation due to gravity or permeation due to capillary action. Due to gravity, the acrylic resin penetrates more downward than above the injection hole 18, and a wider range of the cured acrylic resin 20 is formed below. The acrylic resin composition also penetrates into the gap between the surface material 16 and the intermediate coating material 14.

After the acrylic resin composition has been once injected, it may permeate into the interior of the intermediate coating material 14 and the like from the wall surface of the hole over time, and a void may be formed in the injection hole 18. In that case, an acrylic resin composition can be further injected. As described above, the injection of the acrylic resin composition into the injection hole 18 can be performed a plurality of times by the injection and permeation procedures.
It is preferable from the viewpoint of improving the strength of the repair wall 10 that the injection hole 18 is filled with the acrylic resin composition when the acrylic resin injection process is completed.
When the wall has a large gap and it is difficult to fill the acrylic resin composition in the injection hole 18 from the viewpoint of fluidity, the wall cutting powder obtained at the time of drilling is referred to as the acrylic resin composition. After mixing and improving the viscosity of the acrylic resin composition, it can be injected into the injection hole 18.

(Acrylic resin composition)
In the present invention, the acrylic resin composition used for forming the cured acrylic resin is preferably an acrylic resin composition containing one or more monomers selected from acrylic monomers and methacrylic monomers from the viewpoint of permeability.
In addition, in this specification, when referring to either or both of acryl and methacryl, it is referred to as (meth) acryl, and when referring to either or both of acrylate and methacrylate, it may be referred to as (meth) acrylate.
A preferable acrylic resin composition that can be used in the present invention includes an acrylic resin composition containing a (meth) acrylic monomer, a thermosetting resin, and a curing agent.
Considering the permeability to the voids such as soil particles and soot contained in the intermediate coating material 14, the acrylic resin composition preferably has a viscosity in the range of 80 mPa · s to 100 mPa · s at room temperature (25 ° C.). . The viscosity of the acrylic resin composition can be measured by a method based on JIS K6833-1 (2008) using a B-type viscometer.
When the viscosity of the acrylic resin composition is within the above range, the acrylic resin that can be used in the present invention quickly penetrates into cracks generated in the surface material 16, voids between soil particles contained in the intermediate coating material 14, and the like. . Specifically, natural penetration is possible under conditions of atmospheric pressure for fine cracks of about 0.05 mm, which are about the same as the general diameter of clay particles contained in the intermediate coating material 14, and voids between soil particles. It is possible to naturally penetrate even a narrow portion beyond that regardless of gravity resistance by capillary action.

The acrylic monomer that is the main component of the acrylic resin composition preferably contains at least one selected from an acrylate monomer or a methacrylate monomer. The (meth) acryl monomer may be modified.
Preferred examples of the (meth) acrylic monomer include dicyclopentenyl oxyethylene methacrylate and methoxypolyethylene glycol # 900 methacrylate.
Commercially available products may be used as the (meth) acrylate monomer. For example, Rebuilt resin Rebuilt 300 (trade name, manufactured by Fukuda Jitsugyo Co., Ltd .: dicyclopentenyl oxyethylene methacrylate), NK-ester M-20G (trade name, Shin-Nakamura Chemical Co., Ltd .: methoxypolyethylene glycol # 900 methacrylate).
The content of the (meth) acrylic monomer with respect to the total amount of the acrylic resin composition is preferably in the range of 80% by mass to 90% by mass, and more preferably in the range of 83% by mass to 88% by mass.
Moreover, the acrylic resin composition may contain (meth) acrylic resin particles as long as fluidity is not impaired.

In addition to the (meth) acrylic monomer, the acrylic resin composition contains a thermosetting resin useful for forming a high-strength cured body and a curing agent that cures the thermosetting resin.
Examples of the thermosetting resin include an epoxy resin, a urethane resin, a silicone resin, a urea resin, and a phenol resin.
The content of the thermosetting resin relative to the total amount of the acrylic resin composition is preferably in the range of 10% by mass to 20% by mass, and more preferably in the range of 12% by mass to 16% by mass.
As the curing agent for the thermosetting resin, a peroxide is preferable. The content of the curing agent can be appropriately determined according to the type and content of the thermosetting resin used.

  Since the acrylic resin composition according to the present invention is a liquid (meth) acrylic monomer, it has good fluidity even without containing a solvent. For this reason, since volume shrinkage at the time of hardening becomes smaller than the case where the resin composition which melt | dissolved resin with the solvent is used, it is preferable.

As long as the effects of the present invention are not impaired, other components may be used as additives in the acrylic resin composition for the purpose of adjusting fluidity and curability.
Examples of the additive include chloroprene rubber as a softener, inorganic particles such as aerosil as a viscosity modifier, alkylphenol as a retarder, naphthene cobalt as an accelerator, and the like.

  A commercial item may be used for the acrylic resin composition in this invention, For example, Just Co., Ltd. product, Osmotic Just (brand name) etc. are mentioned. There are examples in which penetration penetration is used to form crack repairing materials for hardened concrete and formation of metal rust preventive films. However, as in the present invention, hardened acrylic resin as a reinforcing body for troweled walls, ceilings, etc. There is no example applied to form.

(Acrylic resin cured body forming process)
In this step, it is injected from the injection hole 18 into the voids of the face piece, for example, the voids between the surface material 16 and the intermediate coating material 14, the soil particles contained in the intermediate coating material 14, the voids between the soots, etc. The permeated acrylic resin composition is cured to form a cured acrylic resin body 20 reinforced with a reinforcing material 24 as shown in FIGS. 3 (D) and 3 (E).
Examples of the material into which the acrylic resin composition can permeate include plaster, earthen wall, wood, rope, cloth, fence, paper, and the like, and materials that can be fixed by hardening the acrylic resin composition include plaster, earthen wall. And earth particles contained in the earth wall, wood, rope, cloth, firewood, paper and the like. In addition, since the acrylic resin composition can fix concrete, mortar, metal, stone, etc., the stone or the wall that has been in contact with a different material such as a cured mortar used for restoration is fixed to the different material. You can also

  The curing time after the acrylic resin composition has penetrated into the face body is usually about 1 to 2 hours, and is quickly cured to form a cured acrylic resin. The curing time can be adjusted from about 30 minutes to about 7 days by controlling the type and amount of curing agent, retarder, etc. contained in the acrylic resin composition.

  When the acrylic resin composition is cured, when the reinforcing material 24 is used, the acrylic resin composition that has penetrated into the reinforcing material 24 is also cured in the same manner, so that the strength of the acrylic resin cured body in the injection hole 18 and the injection hole 18 are increased. The strength around the peripheral surface material 14 is further improved.

The repair wall 10 of the present invention can be formed by the repair method described above. The repair wall 10 in which the high-strength acrylic resin cured body 20 is formed in a desired region in the face body is obtained by adjusting the depth of the injection hole 18 from the face body surface.
The injection hole 18 is formed on the surface of the repair wall 10, and the inside of the formed injection hole 18 is filled with the acrylic resin cured body 20, so that the surface material is not greatly impaired without greatly impairing the appearance of the surface of the repair wall 10. The repair wall 10 can be obtained by fixing between the intermediate coating material 16 and the intermediate coating material 14 or by reinforcing the inside of the intermediate coating material 14 with the acrylic resin cured body 20. It is preferable to apply a surface material 16 on the surface of the reinforcing wall 10 to make up the repaired portion.
In FIG. 4, the injection hole 18 has a depth reaching between the surface material 16 and the intermediate coating material 14, and the acrylic resin cured body 20 is formed in the gap between the surface material 16 and the intermediate coating material 14. FIG. By forming the acrylic resin cured body 20 in the gap between the surface material 16 and the intermediate coating material 14, the surface material 16 and the intermediate coating material 14 are fixed, and the surface material 16 is peeled off from the intermediate coating material 14. Can be suppressed.

(Repair ceiling)
5A is a partial perspective view illustrating the repair ceiling 30 according to one embodiment of the present invention, and FIG. 5B is a partially enlarged view.
The repair ceiling 30 includes a plate member 34 spanned between the beams 32, a ceiling member 36 finished with a trowel from the lower surface of the plate member 34, and an upper surface of the plate member 34 into the ceiling member 36. The plurality of injection holes 38 formed at intervals in the longitudinal direction of the plate member 34, and the gaps filled in the injection holes 38 and between the ceiling member 36 and the plate member 34. And an acrylic resin cured body 40 that has penetrated and cured.
A string-like reinforcing material 42 straddling the injection hole 38 formed in the adjacent plate material 34 through the upper surface of the plate material 34 is inserted into the injection hole 38. By arranging the string-like reinforcing material 42 straddling the injection hole 38 formed in the adjacent plate material 34, the acrylic resin composition penetrates into the string-like reinforcing material 42 and the reinforcing material 42 is cured. The body 40 is formed and the support strength of the repair ceiling 30 is further improved.

(Manufacturing method of repair ceiling)
FIG. 6 is a schematic cross-sectional view illustrating a method for manufacturing a repair ceiling according to an aspect of the present invention.
FIG. 6 (A) shows the ceiling before repair. As shown in FIG. 6 (B), first, the ceiling material 36 is reached from the upper surface of the plate member 34, and a plurality of pieces are provided at intervals in the longitudinal direction of the plate member 34. The injection hole 38 is drilled.
Generally, plaster is used as the ceiling material 36 finished with a trowel from the plate material 34. When the plaster is applied with a trowel from the lower surface of the plate material 34, as shown in FIG. 6A, a part of the plaster reaches the upper part of the ceiling along the side surface of the plate material 34 and covers the side surface and the upper surface of the plate material 34. The rising portion 36A is formed, and the adhesion strength between the plate member 34 and the ceiling member 36 is improved.
At this time, as shown in FIG. 6A, when the thickness of the plate member 34 is t and the interval between the adjacent plate members 34 is 1, t / l is referred to as an anchor coefficient, and t / l exceeds 1. Thus, the rising portion 36A of the stucco is easily formed, and the fixing strength between the plate material 34 and the ceiling material 36 after the stucco is cured is more preferable.

The injection hole 38 reaches the ceiling material 36 but is formed with a depth that does not penetrate the ceiling material 36. The depth of the injection hole 38 and the interval between the injection holes 38 to be formed are appropriately determined according to the strength required for the repair ceiling 30.
Next, as shown in FIG. 6C, a string-like reinforcing material 42 is inserted into the perforated injection hole 38. As shown in FIG. 5A, the string-like reinforcing material 42 is inserted across the upper surface of the plate material 36 and into the injection hole 38 formed in the adjacent plate material 34. Although the reinforcing material 42 is not necessarily required, the strength of the repair ceiling 30 and the resistance to collapse are increased by using the reinforcing material 42.
Similar to the reinforcing material 24 used in the repair wall 10, the reinforcing material 42 is a string-like reinforcing material formed of fibers having a certain thickness and fiber strength, such as hemp string, so that the reinforcing effect is further improved. It is preferable from the viewpoint of being good.

After the string-like reinforcing material 42 straddling the injection hole 38 formed in the adjacent plate material 34 through the upper surface of the plate material 36 is disposed in the injection hole 38, as shown in FIG. Inject things. Injection can be performed at normal pressure. As the acrylic resin composition used in the present embodiment, the same acrylic resin composition as that used for forming the repair wall 10 can be used. The acrylic resin composition injected into the injection hole 38 fills the inside of the injection hole 38 and penetrates into the gap between the plate material 34 and the ceiling material 36, between the fibers of the string-like reinforcing material 42 disposed in the injection hole 38, and the like. To do.
Thereafter, as the acrylic resin composition is cured, as shown in FIG. 5B, the acrylic resin cured body is formed in the injection hole 38, the gap between the plate member 34 and the ceiling member 36, and the string-like reinforcing material 42. 20 is formed, and the plate member 34 and the ceiling member 36 are fixed to form the repair ceiling 30 of the present invention.
Since the repair ceiling 30 of the present invention has the acrylic resin cured body 20 inside the ceiling material 36 formed by a trowel finish such as plaster and between the plate material 34 and the ceiling material 36, the strength of the ceiling material 36 itself is high. Since the plate material 34 and the ceiling material 36 are fixed to each other by the acrylic resin cured body 20, the repair ceiling 30 is obtained in which breakage and collapse are effectively suppressed. Further, by using the string-like reinforcing material 42 straddling the injection hole 38 formed in the adjacent plate material 34, the bonding strength between the adjacent plate materials 34 is further improved.

(1) Example 1
[Preparation of test specimen for plastered earth wall]
First, the base material 12, the intermediate coating material 14 finished with a trowel on the base material 12, and the surface material 16 finished with a trowel on the intermediate coating material 14 for producing the repair wall of one embodiment of the present invention The plaster earth wall test body which used plaster as the surface material 16 was produced.
Stucco soil of grade A test body that is made of the following materials and is made of a general construction method with the following materials, and grade B test body that assumes lower strength than the grade A test body that assumes a deteriorated state. A wall specimen was prepared.

(Grade A specimen)
First, a wooden dance base that is a base is prepared. The wooden dance foundation was made of cedar wood as a frame, and the wooden dance foundation was made of exposed bamboo (diameter 25 cm to 30 cm) and a rope.
Grade A test specimens were prepared for (i) undercoating rough wall fabrication, (ii) hanging rope production, (iii) longitudinal rope production, (iv) transverse rope production, (v) large unevenness application, (vi) 8 steps were applied in order: small unevenness coating, (vii) intermediate coating, and (vii) top plaster iron finish.
Of these, the wood dance base is the base material 12 in the present invention, the undercoating rough wall, the large unevenness, the small unevenness, and the intermediate coating correspond to the intermediate coating material 14 in the present invention, and the top coat plaster is the surface in the present invention. It corresponds to the material 16.

In grade A specimens, after the (i) step, (v) step, (vi) step, and (vii) step, before the ironing of the material in the subsequent step, it is referred to as “scratch” Each step of increasing the surface area and speeding up drying was performed.
The soil used for the preparation of the iron finish intermediate coating was rough wall soil: (Arakida soil: cocoon: water) = 405: 11.5: 50 (kg), large unevenness soil: (Arakida soil: sand: Hidaushisusa : Water) = (53.8: 44.9: 1.4: 17.2) (kg), small unevenness soil (Arakida soil: sand: Hida sashisa: sieved water: water) = (26.9 : 23.0: 1.9: 1.6: 8.6) (kg), and plaster = 3.32 (kg) was used for producing the surface material.

For the preparation of the grade A test body, the material having the following composition using the soil was used.
-Grade A specimen material (kg)-
Undercoat: rough wall soil = 80.6
Lower rope: (rough wall soil: sand: water) = (24.4: 18.4: small amount) 2
Long rope: (Rough wall soil: Sand: Water) = (32.5: 9.2: Small amount)
Yoko rope: (Rough wall soil: Sand: Water) = (52.2: 9.3: Small amount)
Large unevenness correction: (Large unevenness soil: Sand: Water: Susa) = (31.4: 9.6: Small amount: 1.4)
Small unevenness correction: (small unevenness correction soil: sand: sieved cocoon) = (24.8: 2.7: 0.01)
Intermediate coating: (small unevenness soil: sand: water: susa) = (24.8: 2.7: 2.3: 3.2)
Surface material: Stucco = 3.3

(Grade B specimen)
Grade B specimens are the same as the Grade A specimens, and are used after the (i), (v), (vi), and (vii) processes in the Grade A specimen production process. The process of increasing the surface area called “Higaki” and speeding up drying is omitted. In addition, the material to be troweled in each process was changed to the plastering material described below.
-Grade B specimen material (kg)-
Undercoat: rough wall soil = 80.6
Lower rope: rough wall soil = 28.2
Long rope: rough wall soil = 31.8
Yokonawa: rough wall soil = 52.0
Large unevenness repair: Large unevenness repair soil = 43.6
Small unevenness repair: Small unevenness soil = 19.6
Intermediate coating: Small unevenness soil = 31.4
Surface material Stucco = 3.3
That is, in the grade B test body, a material corresponding to the wall body is prepared by performing a trowel finish using only soil as a material, without using a material mixed with a straw and a wedge effective for reinforcing the grade A test body. Produced.

[Production of repair walls]
(Drilling of injection hole)
The injection hole 18 was drilled in the obtained specimen with an electric drill.
(Surface repair wall test)
In the examination of the effect of repairing the surface layer, the injection hole 18 was drilled with a depth of 4 mm and a depth of 50 mm.
The injection hole 18 is an injection hole perpendicular to the surface of the specimen (θ = 0 °, hereinafter referred to as injection hole (a-0)), and has a downward slope from the surface material 16 of the specimen toward the specimen. The injection hole (θ = 30 °, hereinafter referred to as injection hole (a-30)) and the downwardly inclined injection hole (θ = 45 °, hereinafter referred to as injection hole (a-45)) are used as different specimens. Perforated.

(Deep repair wall test)
In the deep repair wall test, an injection hole (b), which is the depth reaching the undercoat with rough wall soil, was drilled with a diameter of 10 mm and a depth of 100 mm.
The injection hole 18 is an injection hole perpendicular to the surface of the test body (θ = 0 °, hereinafter referred to as injection hole (b-0)), and has a downward slope from the surface material 16 of the test body into the test body. The injection hole (θ = 30 °, hereinafter referred to as injection hole (b-30)) and the downwardly inclined injection hole (θ = 45 °, hereinafter referred to as injection hole (b-45)) are used as different specimens. Perforated.

(Injection of acrylic resin composition and production of cured acrylic resin)
An acrylic resin composition [manufactured by Just Co., Ltd., penetrating acrylic resin, penetrating just (trade name)] was poured into the drilled injection hole 18 using a syringe.
For the injection hole (a-0), the injection hole (a-30), and the injection hole (a-45), since the injection hole 18 was filled with the acrylic resin composition by one injection, it was kept for one day. The acrylic resin composition that had been allowed to stand at room temperature and penetrated into the injection hole 18 and the test body was cured to form an acrylic resin cured body, whereby the repair wall 10 was obtained.
The injection hole (b-0), the injection hole (b-30), and the injection hole (b-45) are injected once and left as it is, from the inner wall surface of the injection hole 18 to the gap of the intermediate coating material. Since the acrylic resin composition penetrated, injection and leaving operations were performed three times. Since the injection hole 18 was filled with the acrylic resin composition in the third injection, it was left at room temperature for 5 days, and the acrylic resin composition that had permeated the injection hole 18 and the test body was cured to form an acrylic resin cured body. The repair wall 10 was obtained.

[Evaluation of repair wall]
As an evaluation of the repair wall, the strength was measured.
The strength of the repair wall was measured using a digital force gauge (trade name: manufactured by A & D). Adhering a 40mm x 40mm steel attachment to each of the plastered earth wall test specimens with an epoxy resin (manufactured by Konishi Co., Ltd., Quick 5: trade name) so that resistance due to shear force does not occur along the attachment part. An incision of about 3 mm was made.
Thereafter, a dedicated instrument was attached to measure the adhesion strength between the layers.
Adhesion strength of (II) the interface between the intermediate coating and the Komura repair in the intermediate coating 14, (III) the interface between the minor uneven repair and the large repair in the intermediate coating 14, and (IV) the interface between the rough wall and the large repair. Each was measured. Furthermore, (V) the strength of the rough wall was measured.
A measurement location is a lower left part of the plastered earth wall test body. Measurement was carried out at four points for each specimen.
As the surface layer repair wall test, (II) near the interface between the intermediate coating and Komura repair, (III) the interface between the small unevenness and large unevenness in the intermediate coating material 14, and (IV) the interface between the rough wall and the large unevenness repair. The average value of the measurement results at four locations in the adhesion strength was used as the evaluation of the surface layer reinforcement.
(V) As the strength of the rough wall, the average value of the measurement results at four locations was used for evaluation of deep reinforcement.
As a control example, the same measurement was performed on a test body to which an acrylic resin composition was not injected. In the control example, the adhesion strength at the interface between the (I) plaster as the surface material and the intermediate coating was further measured.

The results are shown in FIG. FIG. 7 is a graph showing the adhesion strength of the soil wall of the control example and the adhesion strength of the repair wall of this example having a cured acrylic resin. For reference, the standard for adhesion of porcelain tiles in buildings is shown by the wavy line in FIG.
Unlike the attached tile, the repair wall of the present invention is an integrated wall body. For this reason, if the intensity | strength of the vicinity of the adhesion intensity | strength standard shown with the wavy line is achieved, it can be evaluated that it shows sufficient intensity | strength as a wall body.
As is clear from FIG. 7, it was confirmed that the repair wall of the present invention significantly improved the adhesion strength as compared with the control example.

In the surface layer repair, the difference in adhesion strength depending on the formation angle (θ) of the injection hole 18 is not clear, and it can be seen that the adhesion strength is improved as compared with the control example, and the adhesion strength is practically sufficient.
In the deep repair, the difference in the adhesion strength due to the formation angle (θ) of the injection hole 18 appeared remarkably. In deep part repair, according to the detailed examination inside the repair wall, the acrylic resin cured body was formed to reach the horizontal rope and the vertical rope of the rough wall.
Compared to the intermediate coating, the rough wall has larger soil particles and more voids, so the acrylic resin composition is filled more in the voids of the soil particles than in the vicinity of the surface layer. As a result, high-strength acrylic resin is cured over a wide area. A body is formed, and it is considered that the strength is dramatically improved by this acrylic resin cured body.
Moreover, since the formation depth of the injection hole 18 reaches the deep part, the acrylic resin composition has penetrated to some extent in the layers of the intermediate coating because the acrylic resin composition has permeated into the layers of the intermediate coating layer. It is considered that the strength was further improved.
At this time, since the angle of the injection hole 18 is a downward slope, the acrylic resin composition quickly reaches the deep part of the injection hole 18 and further penetrates into the soil particles from the inner wall of the injection hole 18 more quickly. The acrylic resin composition can be supplied from the injection hole 18, and the formation area of the cured acrylic resin is larger than the injection hole 18 of θ = 0 that does not have a downward gradient, enabling more effective reinforcement. It is thought that it became.

Even in grade B test specimens that were prepared assuming deterioration and that had low initial strength, practically sufficient strength was expressed. Therefore, the repair method of the present invention was applied to deteriorated iron-finished walls, ceilings, etc. It turns out that it is effective for reinforcement.
In addition, a marked improvement in strength was also observed in the grade A test specimen prepared by obtaining a regular process. This is because, by mixing straw, susa, etc. with the soil, voids are formed and the initial strength is reduced, but there are many voids for infiltrating the acrylic resin composition, so effective strength improvement effect It is thought that was obtained.
From the results of Grade A test specimens, the repair method of the present invention is implemented from the beginning for new troweled wall bodies and ceiling materials, and the appearance is traditional plaster-finished wall bodies and ceiling materials. However, it is considered that the risk of surface peeling, collapse, cracking, etc. over time can be significantly reduced.

DESCRIPTION OF SYMBOLS 10 Repair wall 12 Base material 14 Surface material 16 Intermediate coating material 18 and 38 Injection hole 20 Acrylic resin hardening body 30 Repair ceiling

Claims (7)

A base material, an intermediate coating material that is finished with a trowel on the base material, and a mixture of materials selected from straw, hemp fiber, furin and slaked lime with clay or earth, and the intermediate coating material with a trowel And a wall body provided with a surface material made of plaster containing slaked lime ,
An injection hole drilled into the wall from the surface of the surface material;
An acrylic resin cured body filled in the injection hole and penetrating from the hole wall of the injection hole into the space between the soil particles contained in the intermediate coating material and cured in the space ;
Repair wall with.   The repair wall according to claim 1, wherein a hole wall surface of the injection hole has a downward slope from a surface material of the wall body into the wall body.   The repair wall according to claim 1 or 2, wherein a string-like reinforcing material is fixed in the acrylic resin cured body from the injection hole to a deep portion of the wall body.   The acrylic resin composition forming the acrylic resin cured body is an acrylic resin composition containing at least one monomer selected from acrylic monomers and methacrylic monomers, a thermosetting resin, and a curing agent. The repair wall according to any one of claims 1 to 3. A base material, an intermediate coating material that is finished with a trowel on the base material, and a mixture of materials selected from straw, hemp fiber, furin and slaked lime with clay or earth, and the intermediate coating material with a trowel A step of perforating an injection hole from the surface of the face piece in a repair target part of the face piece of the ceiling or wall provided with a surface material made of plaster containing slaked lime ,
Filling the injection hole with an acrylic resin composition and injecting the acrylic resin composition from the hole wall of the injection hole into the face body;
The acrylic resin composition injected from the injection hole is infiltrated into the gap formed between the surface material and the intermediate coating material included in the face piece, and the void between the soil particles contained in the intermediate coating material. Curing and forming an acrylic resin cured body in the gap ;
Repair method for ceiling or wall facepieces. A plate spanned between the beams,
A ceiling material finished with a trowel from the lower surface of the plate material;
A plurality of injection holes formed from the upper surface of the plate material into the ceiling material and spaced in the longitudinal direction of the plate material;
An acrylic resin cured body filled in the injection hole and penetrating into the ceiling material and cured;
Repair ceiling with. The injection hole has a string-like reinforcing material that is inserted into the injection hole and straddles the injection hole formed in the adjacent plate material through the upper surface of the plate material,
The repair ceiling according to claim 6, further comprising an acrylic resin cured body in which an acrylic resin composition has penetrated into the reinforcing material and has been cured.